Always set presence/up from go tsmon apps.

common/tsmon/metric/standard_metrics_test.go

 // Copyright 2016 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package metric
 
 import (
         "testing"
         "time"
 
+        "github.com/luci/luci-go/common/tsmon"
+        "golang.org/x/net/context"
+
         . "github.com/smartystreets/goconvey/convey"
 )
 
 func TestStandardMetrics(t *testing.T) {
         t.Parallel()
 
         durMillis := 5.0
         dur := time.Duration(durMillis * float64(time.Millisecond))
 
         Convey("UpdatePresenceMetrics updates presenceMetric", t, func() {
-                c := makeContext() // Defined in metrics_test.go
-                v, err := presenceMetric.Get(c)
-                So(v, ShouldEqual, false)
-                So(err, ShouldBeNil)
+                c, m := tsmon.WithDummyInMemory(context.Background())
+                registerCallbacks(c)
 
-                UpdatePresenceMetrics(c)
-                v, err = presenceMetric.Get(c)
-                So(v, ShouldEqual, true)
-                So(err, ShouldBeNil)
+                So(tsmon.Flush(c), ShouldBeNil)
+
+                So(len(m.Cells), ShouldEqual, 1)
+                So(len(m.Cells[0]), ShouldEqual, 1)
+                So(m.Cells[0][0].Name, ShouldEqual, "presence/up")
+                So(m.Cells[0][0].Value, ShouldEqual, true)
         })
 
         Convey("UpdateHTTPMetrics updates client metrics", t, func() {
                 c := makeContext()
                 name, client := "test_name", "test_client"
                 d, err := requestBytesMetric.Get(c, name, client)
                 So(d, ShouldBeNil)
                 So(err, ShouldBeNil)
                 d, err = responseBytesMetric.Get(c, name, client)
                 So(d, ShouldBeNil)
@@ skipping 72 matching lines @@
                         So(err, ShouldBeNil)
                         d, err = serverResponseBytesMetric.Get(c, code, name, isRobot)
                         So(d.Sum(), ShouldEqual, 321)
                         So(err, ShouldBeNil)
                         v, errV = serverResponseStatusMetric.Get(c, code, name, isRobot)
                         So(v, ShouldEqual, 1)
                         So(err, ShouldBeNil)
                 })
         })
 }